Securing mechanism for doors



F. M. CURRAN ET AL SECURING MECHANISM FOR DOORS May 8, 1928.

Filed March 51. 1926 s Sheets- 8115561 1 z z/enfr/r/ May 8, 1928. 1,669,371 F. M. CURRAN ET AL SECURING MECHANISM FOR DOORS- C'7 File:1%arch 51. 1926 3 Sheets-Sheet 2 mix May 8, 1928.

w 1,669,371 F. M. .CURRAN ET AL v SECURING MECHANQSM FOR DOORS Filed March 31. 1926 I5 Sheets-Sheet 3 Patented May 8, 1928.

PATENT OFFICE.

FRANK -M. CURRAN AND CHARLES B. NORRIS; 0F GRANDJRAPIDS, MICHIGAN, 'A S. SIGNORS T0 H'ASKELITE MANUFACTURING CORPORATION, .A CORPORATION OI NEW 'YORK.

SECURING MECHANISM FOB nooas.

Application filed March 31, 1926.. Serial No. 98,677.

after be pointed out with particularity in the 7 claims but, for a full understanding of our invention and of its objects and advantages,

reference may be had to the following detailed description taken in connection with the accompanying drawings, wherein:

Figure 1 is a front view of a clothesvault or safe equipped with securing mechanism constructed in accordance with the presentinvention, portions of the vault or safe being broken out; Fig. 2 is ZLVVIGW on an enlarged scale of the inside of the vault or safe in the vicinity of the securing niechanisinpth-e securing mechanism being in its release position; Fig. 3 is a View similar to Fig. 2, showing the mechanism in its securing position the upper and lower portions of the structure to which the mechanism is applied being broken away; Fig. 4 is a side elevation of the actuating cam, viewed from the opposite side of that appearing in Fig. 3;

. Fig. 5 is a section taken .on line 55 of at; Fig. 6 is a section taken on line 6 6 of'Fig. 2 and Fig. 7 is a section taken on line 7-7of Fig. 3. 1

Referring to the drawings, 1 represents the wall of a vault or other struc-ture having an opening adapted to be closed by a door 2 that is shown as being supported adjacent to one of its long edges by hinges 3. As

best shown in Figs. 6 and7, the wall and the door are shaped so as-to have-overlap ping flanges 4i and 5, one of these flanges carrying a compressible gasket 6 which will seal the joint between the door and the wall when suflicient pressureis applied after .the door is closed. The securing mechanism comprises a vertical shaft 7 rotatably mounted on the inner side of the door near the free long edge. On this shaft are a plurality of dogs 8 which, in one angular position of the shaft as shown in Fig. 7 engage with the inner side of the wall 1 adjacent to the door opening; whereas, in another angular position of the shaft, as shown in Fig. 6,

wise direction.

the dogs lie a sufficient distance inwardly from theedge of the door to-pass through the door opening when the'door is opened. In :the particular arrangement shown, there. are three clamping dogs, one at the top, one at the bottom, and another midway between the top and bottom. This latter dog has an extension 10 on the rear thereof; this extension terminating in two lugs 11 and 12 spaced apart from eachother. On the lug. 12 is a roller 13 of such a diameter as to leave a. gap or space between it and the lug 11. An; operating shaft 14 for the securing mechanism extends through the door in the same horizontal plane as thecentral securing lug, and. on the inner side of this lug and the shaft 7. On the outer end of the operating shaft is a handle 15 of any usual or suitable construction. The handle shown is of the type that is loose on the shaft so as nor-j inally to *be freely rotated thereon; there beingasecu'ring means 16 by means of which the handle may be secured totlie shaft so as to permit the operating shaft to be rotated thereby. On the operating shaft, on the inner side of the door, is a. cam device 17.

This cam device has a peripheralflange 1 8 extending in a spiral direction around the operating-shaft; the radial distance of the flange from the axis of the operating shaft increasing from one end of the flangeto the other,and one end of thefla-nge being spaced lengthwise of the operating'sh'aft a considerable distance from the other end. "The flange is so shaped and the parts are so positioned; with respect to each other, that the flange enters'the notch or space between the lug 11 and the roller 13.' Therefore, as the operating shaft is turned in one direction, the,- flan e acts on the roller 13 and jsw-ings the shaft 7 in the counterclockwise direction as viewed in Figs. =6 and 7 whereas, when the operating shaft is turned in the other direction, the cam flange engages with the lug 11 and swings the shaft 7 in the clock- In other words, when the operating shaft'is turned in one direction, it swings the dogs into holding position and, when turned in the other direction, it swings the dogs back into release position. In swinging the dogs to the release position very little energy is required, and therefore the cam flange may be allowed toen- However, during the final securing movement of the dogs, when the door is closed, great pressure is applied in order to draw the door inwardly and compress the packing,

and the anti-friction roller '13 has been provided to reduce the friction between the cam and the dog which it directly actuates.

It will be seen that the angle of the cam flange is not uniform. That portion of the cam that engages with the anti-friction roller as the dogs approach their holding position and afterwards, being arranged at approximately right angles to the long axis of the operating shaft; whereas the other end of the cam flange makes acconsiderable angle with, such axis. The result 18 that the force applied to the operating handle isniultiplied many times during the final securing and clamping movements of the dogs, so

that the dogs exert a very powerful clamping action on the-door; Upon the release of thedogs, their swinging movement is small during the" first portion of the swinging I movement of the operating handle but, when swings through an angle of almost ninety degrees between the holding and release positlon, having its cylinder elements lying aproximately parallel with the axis of the op erating shaft in the first position and approximately at right angles to that axis in the other position, the angle of the inclined face of the cam flange with respect to said axis must decrease from one end of the cam flange toward the other. Consequently the I cam flange may be said to have a varying pitch, a varying radius and a working face of varying inclination.

WVe claim:

1. The combination with a door adapted V to close in overlapping contact with a memher beside the opening the door is designed to close, of a dog mountedon the inner side of the door so as to be capable of swinging between a release position behind the door and a clamping position 1n engagement with the inner side of sald member, said dog having a groove therein, operating shaft extending through the door at right angles to the axis about which the dog swings, and a cam of varying radius and varying pitch secured on the inner end of the shaft and engaged in the groove of said dog.

2. The combination with a door, of a dog mounted on the inner side of the door so as to be capable of swinging from a release position behind the-door to a locking position in which it projects beyond an edge of the door, said dog having a groove therein, an operating shaft extending through the door, a cam on the inner end of the shaft engaged in the groove in said dog to swing the. dog, the pitch of the cam throughout that part thereof that engages the dog while the latter is in the vicinity of its locking position being small compared with the pitchat other points. H

3. The combination with adoor, of a dog mounted on the inner side otthe door so as to be capable of swinging about an axis parallel with an edge of the door between a position in which it lies behind the door and a position in which it projects beyond said edge, said dog having a groove bounded on one side by an antifriction roller, an operating shaft extending through the door at right angles to said axis,and acam on said shaft and extending into said groove.

4:. The combination with a door, of a dog mounted on the inner side of the door so as to be capable of swinging about an axis parallel with an edgeof the door between a position in which it lies behind the door and a position in which. it projects beyond said, edge, said dog having a groove bounded on one side by an antifriction roller, an operating shaft extending through the door at right angles to said axis, and a cannon said shaft and extending into said groove, said camlbeing of varying radius and of varying pitc 1,

cation.

, FRANK M. onnnan.

In testimony whereof, we sign this specifi- 

